dtsi: Generate qcom,dsi-phy-regulator-ldo-mode; if necessary

If qcom,regulator-ldo-mode is set on the DSI controller,
qcom,dsi-phy-regulator-ldo-mode; should be set on mainline Linux
for the DSI PHY.

Author: stephan-gh

dtsi.py

@@ -50,4 +50,11 @@ def generate_panel_dtsi(p: Panel, options: Options) -> None:
 	data-lanes = <{' '.join(map(str, p.lane_map.phys2log[:p.lanes]))}>;
 	remote-endpoint = <&panel_in>;
 }};
+''')
+
+		if p.ldo_mode:
+			f.write('''
+&dsi_phy0 {
+	qcom,dsi-phy-regulator-ldo-mode;
+};
 ''')

panel.py

@@ -276,6 +276,13 @@ def __init__(self, name: str, fdt: Fdt2, node: int) -> None:
 			self.h.size = phy_size_mm[0]
 			self.v.size = phy_size_mm[1]
 
+		# Check DSI controller if LDO mode is needed
+		self.ldo_mode = False
+		dsi_ctrl = fdt.getprop_int32(node, 'qcom,mdss-dsi-panel-controller')
+		if dsi_ctrl is not None:
+			dsi_ctrl = fdt.node_offset_by_phandle(dsi_ctrl)
+			self.ldo_mode = fdt.getprop_or_none(dsi_ctrl, 'qcom,regulator-ldo-mode') is not None
+
 	@staticmethod
 	def parse(fdt: Fdt2, node: int) -> Panel:
 		name = fdt.getprop_or_none(node, 'qcom,mdss-dsi-panel-name')